It's like a language-translation game (similar to chants of sennaar), but with abilities - I like it!
I enjoyed this, but you need to teach the player that they can make up their own spells! I would also say: Don't hide the player with the scroll so I can't see what happens, and also, having to keep clicking through the spells to get to the next one became laborious. Perhaps give players the opportunity to write their own notes about what each of the runes do?
Wonderful concept, please expand on this.